Disclaimer:
The material presented here is assorted and compiled from various sources. If there are any inconsistencies,
they are entirely due to my typographical and knowledge based errors. I am providing this material, for the
benefit of my class students, as comprehensive notes with diagrams drawn from various sources, which I have
acknowledged elsewhere, on one platform. I will strive to update these lessons, and there is no end to it,
but I will strive to do it as long as I live. This is my 40th year of teaching and 30 years of research carrier.
I sincerely hope this effort of mine and my friends help my students and fellow teachers to get most of it,
not all, but on one platform, i.e. my web pages are exclusively for them and only for them. I look forward
for your constructive responses.